[Zope] Synchronising a navigation tree

I need to be able to synchronise a tree tag based navigation tree of unlimited depth in one frame with the contents of another frame that provides its own navigation (i.e. hyper links). The problem basically boils down to being able to specify what node/s in a tree are open, either adding to or overriding the currently open nodes. Has anyone tackled this problem and if so what technique did you use ? TIA Robert Leftwich